Re: [PATCH 1/1] of: of_reserved_mem: Ensure cma reserved region not cross the low/high memory

[Rob Herring]

On Wed, Dec 14, 2016 at 4:21 PM, Laura Abbott <labbott@xxxxxxxxxx> wrote:
> On 12/14/2016 12:45 PM, Rob Herring wrote:
>> On Wed, Nov 23, 2016 at 5:37 AM, Jason Liu <jason.hui.liu@xxxxxxx> wrote:
>>> Need ensure the cma reserved region not cross the low/high memory boundary
>>> when using the dynamic allocation methond through device-tree, otherwise,
>>> kernel will fail to boot up when cma reserved region cross how/high mem.
>>
>> The kernel command line code setting CMA already deals with this. Why
>> don't we just call the CMA code (cma_declare_contiguous) to deal with
>> this?
>>
>> Rob
>>
>
> That was proposed in the first version[1] but I think this is a generic
> problem not specific to CMA. Even non-CMA reservations trying to span
> zones could cause problems so the devicetree allocation code should
> restrict reservations to a single zone.

Fair enough, but that's not what this patch does. It's only for CMA.

Rob